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Convective heat transfer characteristics of secondary refrigerant based CNT nanofluids in a tubular heat exchanger.

Author(s) : KUMARESAN V., VELRAJ R., DAS S. K.

Type of article: Article, IJR article

Summary

This paper reports an experimental study on the convective heat transfer characteristics of a secondary refrigerant based CNT nanofluids in a tubular heat exchanger. The nanofluid is prepared by dispersing the multiwalled carbon nanotubes (MWCNT) in the water–ethylene glycol mixture (70:30 by volume). The results show that the convective heat transfer coefficient is enhanced to a maximum of ~160% for the nanofluid containing 0.45 vol. % MWCNT, which could not be attributed solely by enhanced thermal conductivity of the nanofluids. Particle rearrangement, the very high aspect ratio and delaying the boundary layer development due the random movement of the carbon nanotubes are the possible mechanisms. Further, there is an appreciable decrease in Reynolds number for a given velocity for all the nanofluids. The enhancement in the friction factor is negligible at higher velocity and higher temperature for the nanofluids with 0.15 vol. % MWCNT.

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Pages: 2287-2296

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Details

  • Original title: Convective heat transfer characteristics of secondary refrigerant based CNT nanofluids in a tubular heat exchanger.
  • Record ID : 30005980
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 35 - n. 8
  • Publication date: 2012/12

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